Tipless retrieval device

Patent metadata

Field	Value
Publication number	US-2016166269-A1
Application number	US-201514959216-A
Country	US
Kind code	A1
Filing date	Dec 4, 2015
Priority date	Dec 10, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A medical retrieval device may include a longitudinally extending tubular member having a cut pattern. The pattern may include an x-shaped portion and a plurality of legs extending proximally of the x-shaped portion. At least one of the plurality of legs may have a varied cross-section along its length. The medical retrieval device may further include a longitudinally extending drive member operably coupled to the tubular member.

First claim

We claim:

1 . A medical retrieval device, comprising:
a longitudinally extending tubular member having a cut pattern, wherein the pattern includes an x-shaped portion and a plurality of legs extending proximally of the x-shaped portion, wherein at least one of the plurality of legs has a varied cross-section along its length; and a longitudinally extending drive member operably coupled to the tubular member.

2 . The medical retrieval device of claim 1 , wherein the at least one of the plurality of legs has a proximal portion with a semi-circular cross-sectional shape and a distal portion with a circular cross-section shape.

3 . The medical retrieval device of claim 2 , wherein the distal portion is chemically etched.

4 . The medical retrieval device of claim 1 , wherein the plurality of legs and the x-shaped portion are monolithically formed.

5 . The medical retrieval device of claim 1 , wherein the x-shaped portion defines a distal-most end of the medical retrieval device.

6 . The medical retrieval device of claim 1 , wherein a distal-most end of the medical retrieval device is tipless.

7 . The medical retrieval device of claim 1 , wherein each leg of the plurality of legs is cut into two distal leg portions.

8 . The medical retrieval device of claim 7 , wherein a distal leg portion of a first leg of the plurality of legs is continuously formed with a distal leg portion of a second leg of the plurality of legs.

9 . The medical retrieval device of claim 7 , wherein the two distal leg portions of at least one leg of the plurality of legs are coupled together.

10 . The medical retrieval device of claim 1 , further including:
at least one strut coupled to at least one leg of the plurality of legs.

11 . A method of forming a medical retrieval device, comprising:
cutting a pattern into a longitudinally extending tubular member, wherein the pattern includes an x-shaped portion and a plurality of legs extending proximally of the x-shaped portion; machining the pattern such that at least one of the plurality of legs has a varied cross-section along its length; and heat-treating the pattern to form a monolithic one-piece retrieval device.

12 . The method of claim 11 , wherein cutting a pattern includes laser cutting.

13 . The method of claim 11 , wherein machining the pattern includes chemically etching the pattern such that at least one of the plurality of legs has a varied cross-section along its length.

14 . The method of claim 11 , further including:
coupling a longitudinally extending drive member to the tubular member.

15 . The method of claim 14 , wherein coupling includes welding.

16 . A method of forming a medical retrieval device, comprising:
cutting a longitudinally extending tubular member, wherein the cutting includes:
forming a first cut line in the tubular member, the first cut line oscillating back and forth between a first axial location along the tubular member and a distal-most end of the tubular member; and
forming a second cut line in the tubular member, the second cut line oscillating back and forth between a second axial location along the tubular member and the distal-most end of the tubular member;
wherein forming the first cut line and forming the second cut line defines an x-shaped portion and a plurality of legs extending proximally of the x-shaped portion; and
machining at least one of the plurality of legs such that is includes a varied cross-section along its length.

17 . The method of claim 16 , wherein cutting includes laser cutting.

18 . The method of claim 16 , wherein machining includes chemically etching the at least one of the plurality of legs such that the at least one of the plurality of legs has a varied cross-section along its length.

19 . The method of claim 16 , further including:
after the cutting, heat-treating the tubular member to form a monolithic one-piece retrieval device.

20 . The method of claim 16 , further including:
coupling a longitudinally extending drive member to the tubular member.

Assignees

• Boston Scient Scimed Inc

Inventors

• Teague James
• Stemler David

Classifications

• B23K26/38

  by boring or cutting · CPC title

• A61B17/221 Primary

  Gripping devices in the form of loops or baskets {for gripping calculi or similar types of obstructions (surgical snare instruments A61B17/32056)} · CPC title

• A61B2017/00526

  Methods of manufacturing · CPC title

• A61B2017/2212

  having a closed distal end, e.g. a loop · CPC title